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If you test Saurabh's suggestion, make sure you subtract TODAY(). Otherwise, it fails to accept valid time entries.<br />
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Start time--&gt; &nbsp; &nbsp; &nbsp; &nbsp;=NOW()-TIME(,5,)-TODAY()<br />
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End Time--&gt; &nbsp; &nbsp; &nbsp; &nbsp; =NOW()+TIME(,5,)-TODAY()
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If you test Saurabh's suggestion, make sure you subtract TODAY(). Otherwise, it fails to accept valid time entries.

Start time-->        =NOW()-TIME(,5,)-TODAY()

End Time-->         =NOW()+TIME(,5,)-TODAY()

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The advice by Byundt is preferable as it accepts the shortcut. Thank you. Now, how can I spread this Custom validation over a range of cells without typing the cell address in each new cell?
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The advice by Byundt is preferable as it accepts the shortcut. Thank you. Now, how can I spread this Custom validation over a range of cells without typing the cell address in each new cell?

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How to set a validation rule to allow input of a time within, say +/-5 min of the current system time? (I know that one can ensure that with Shift-Ctrl+:, but nonetheless. Excel 2007.<br />
<br />
Thanks.
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How to set a validation rule to allow input of a time within, say +/-5 min of the current system time? (I know that one can ensure that with Shift-Ctrl+:, but nonetheless. Excel 2007.

Thanks.

Time input validation in Excel

Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.